CaltechAUTHORS
Published March 2010 | Published
Journal Article Open

Performance of the CMS Level-1 trigger during commissioning with cosmic ray muons and LHC beams

Apresyan, A. ORCID icon
Bornheim, A. ORCID icon
Bunn, J. ORCID icon
Chiorboli, M.
Gataullin, M.
Kcira, D. ORCID icon
Litvine, V.
Ma, Y.
Newman, H. B. ORCID icon
Rogan, C. ORCID icon
Timciuc, V.
Veverka, J.
Wilkinson, R.
Yang, Y.
Zhang, L.
Zhu, K.
Zhu, R. Y. ORCID icon
CMS Collaboration
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Abstract

The CMS Level-1 trigger was used to select cosmic ray muons and LHC beam events during data-taking runs in 2008, and to estimate the level of detector noise. This paper describes the trigger components used, the algorithms that were executed, and the trigger synchronisation. Using data from extended cosmic ray runs, the muon, electron/photon, and jet triggers have been validated, and their performance evaluated. Efficiencies were found to be high, resolutions were found to be good, and rates as expected.

Additional Information

© 2010 IOP Publishing Ltd and SISSA. Received: December 1, 2009; Revised: March 1, 2010; Accepted: March 3, 2010; Published: March 19, 2010. We thank the technical and administrative staff at CERN and other CMS Institutes, and acknowledge support from: FMSR (Austria); FNRS and FWO (Belgium); CNPq, CAPES, FAPERJ, and FAPESP (Brazil); MES (Bulgaria); CERN; CAS, MoST, and NSFC (China); COLCIENCIAS (Colombia); MSES (Croatia); RPF (Cyprus); Academy of Sciences and NICPB (Estonia); Academy of Finland, ME, and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF, DFG, and HGF (Germany); GSRT (Greece); OTKA and NKTH (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland); INFN (Italy); NRF (Korea); LAS (Lithuania); CINVESTAV, CONACYT, SEP, and UASLP-FAI (Mexico); PAEC (Pakistan); SCSR (Poland); FCT (Portugal); JINR (Armenia, Belarus, Georgia, Ukraine, Uzbekistan); MST and MAE (Russia); MSTDS (Serbia); MICINN and CPAN (Spain); Swiss Funding Agencies (Switzerland); NSC (Taipei); TUBITAK and TAEK (Turkey); STFC (United Kingdom); DOE and NSF (USA). Individuals have received support from the Marie-Curie IEF program (European Union); the Leventis Foundation; the A. P. Sloan Foundation; and the Alexander von Humboldt Foundation.

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